Abstract
We outline the research leading to development and application of the autonomous fibre-optic rotational seismograph (AFORS), which utilises the Sagnac effect for a direct measurement of rotation. The main advantage of AFORS comparing to other kinds of rotational seismometers is it completes insensitivity to linear motions as well as a direct measurement of rotational components emitted during seismic events. The presented system contains a special autonomous signal processing unit which optimises its operation for the measurement of rotation motions, whereas a newly applied telemetric system based on the Internet allows for a remote AFORS control. The laboratory investigation of the two such devices indicated they keep accuracy no less than 5.1·10−9 to 5.5·10−8 rad/s in the frequency bandpass from 0.83 to 106.15 Hz. Moreover, they protect linear changes of sensitivity in above bandpass. The first experimental results of AFORS-1 operation in the Ksiąz (Poland) seismological observatory are also presented and compared with data obtained from other types of rotational devices simultaneously used in this observatory.
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